As the array of ETF product offerings has expanded in recent years, the biotech space has seen significant activity. Currently, there are five biotech ETFs that have accumulated nearly $3.5 billion in aggregate assets. Each of these funds focuses on stocks in the biotechnology industry, and in many cases there is significant overlap between the [...] Related Stories: Which Biotech ETF Is Best For You? Biotech ETFs Get Big Boost From HGSI Biotech ETFs Surge Again On M&A News